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1987 Buick Century Questions & Answers
Only blows out defrost
you have a broken vacuum line going to the heater control module.It will be a black plastic line running though firewall from engine capartment.
Ajusting valves
No adjustment, unless the motor is apart & yourputting the heads back onThey have been hydraulic lifters for at least 50 yearsThe motor is old & the lifters are dirty & worn & possiblyother issues in valve train,sticking valves,worn valve guidesetc
84 buick century just randomly shuts off while driving and wount start for awhile
It may be tough to troubleshoot if you can't duplicate the problem in the shop. Especially on a car that old. Someone will have to check for fuel pressure and spark when it fails to start and then go from there. Could be a long list of things without knowing where to start looking.My guess would be a relay or the ignition module get hot and then cool down. But that is only a guess.
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